/*
 This file is part of the software framework JStatCom, 
 a library for building applications for data based analysis.

 Copyright (C) 2000-2005  Markus Kraetzig

 This library is free software; you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License as
 published by the Free Software Foundation; either version 2.1 of the
 License, or (at your option) any later version.

 This library is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 USA
 */

package com.jstatcom.model;
/**
 * Must be implemented by listeners that need to be notified about
 * changes in JSCData objects. A JSCDataListener
 * can register itself as a listener to an event of a specific JSCDataEventType
 * via JSCData.addJSCDataListener.
 * 

 * Usage Note:

 * The events that are fired by the JSCData objects are intended
 * for internal communication only. Events do not occur in the EventDispatchingThread.
 * Clients should rather listen to changes in JSCSymbol objects, especially
 * if GUI related actions are performed.
 *
 * @author Markus Kraetzig
 */
public interface JSCDataListener {

/**
 * Called when a JSCData object fires a JSCDataEvent
 * of a JSCDataEventType that this object has registered to
 * via JSCData.addJSCDataListener.
 * 
 * @param evt the data event with all relevant information about the change 
 */
void valueChanged(JSCDataEvent evt);
}